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ERIC Number: EJ1014924
Record Type: Journal
Publication Date: 2013-Apr
Pages: 2
Abstractor: As Provided
ISSN: ISSN-0031-921X
Revisiting the Least Force Required to Keep a Block from Sliding
De, Subhranil
Physics Teacher, v51 n4 p220-221 Apr 2013
This article pertains to a problem on static friction that concerns a block of mass "M" resting on a rough inclined plane. The coefficient of static friction is microsecond and the inclination angle theta is greater than tan[superscript -1] microsecond. This means that some force "F" must be applied (see Fig. 1) to keep the block from sliding down the incline. Familiar textbook versions of this problem ask for the minimum value of "F" when it is applied in a certain specified direction, for example, parallel to the incline (phi = 0 in Fig. 1) or perpendicular to the incline (phi = 90 degrees). Here, we generalize the problem by allowing the direction of the force to be adjustable and asking what the absolute minimum value of "F" is in order to keep the block from sliding. (Contains 3 figures.)
American Association of Physics Teachers. One Physics Ellipse, College Park, MD 20740. Tel: 301-209-3300; Fax: 301-209-0845; e-mail:; Web site:
Publication Type: Journal Articles; Reports - Descriptive
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A
Grant or Contract Numbers: N/A